Improvement in burglar-alarms



.RNDGE. Burglar Alarm.- 10.201,836.` Patented March 26, 1878,',

WFTNEESEE y INVENT EF:

f y ma@ Tir;

ALFRED RINDGE, OF

MENDON, MIGHIGAN. 'I

IMPROVEMENT IN BURGLAR-ALARMS.

Specification forming part of Letters Patent No. 201,836, dated March 26, 1878,' application led March 2, 1878.

To all whom t may concern:

Be it known that I, ALFRED RINDGE, of Mendon, in the county of St. Joseph and State of Michigan, have invented certain new and useful Improvements in Burglar-Alarms and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art towhich it pertains to make and use it, reference being had to the accompanying drawings, which form part of this specication.

My invention relates to an improvement in burglar-alarms; and Ait consists in the combination of a spring, which has a screw formed upon one end for screwing into the frame of the door, and a lever which pries the front end placed to be exploded by the free end of the spring, which is bent backward toward the screw, as shown.

Pivoted upon a stud or projection, d, which extends from one end of the spring, is the opf erating -lever g, the shorter ond of which catches under the free end of the spring, and as the long end of the lever is forced forward toward the screw it opens the free end of the spring outward, and holdsit ready to snap downward upon the cap as soon as the lever is tripped so as to release it. In order that this lever may catch readily under the free end i ofthe spring, the end of the spring upon which the screw is formed is made much more narrow than the free end, so that the thickness of the spring and the thickness of the lever together will only be about as wide as the free end of the spring alone. By thus forming the spring and lever in proportion to the free end, the trouble or necessity of bending the short end of the lever is avoided, and the construction of the alarm is simplified accordingly.

After the open spring is secured to the doorframe, and is turned in suchva direction that the long end of the lever will project across the edge of the door or any other moving object, a cap is placed upon the nipple, and it is then ready for use.

Any attempt to open the door or window will cause the lever to release the free end' of the spring, which will fall with suflicient force Having thus described my invention, `I

claim- The combination of the spring a, having the screw b formed upon one end, with the nipple c and lever g, the lever being pivoted upon a projection extending out from the side of the spring, substantially as shown and described.

In testimony that I claim the foregoing I have hereunto set my hand this 21st day of February, 1878.

ALFRED RINDGE. Witnesses:

LnoNmAs G. WooLLEY, LENTULUS HUNTLEY. 

